Assessment of the State-of-the-art of Numerical Simulation of Enhanced Geothermal Systems
Author:
Publisher:
Published: 1999
Total Pages:
ISBN-13:
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Geoenergy Modeling III
Author: Norihiro Watanabe
Publisher: Springer
Published: 2016-11-10
Total Pages: 109
ISBN-13: 3319465813
DOWNLOAD EBOOKThis book focuses on numerical modeling of deep hydrothermal and petrothermal systems in fractured georeservoirs for utilization in Geothermal Energy applications. The authors explain the particular challenges and approaches to modeling heat transport and high-throughput flow in multiply fractured porous rock formations. In order to help readers gain a system-level understanding of the necessary analysis, the authors include detailed examples of growing complexity as the techniques explained in the text are introduced. The coverage culminates with the fully-coupled analysis of real deep geothermal test-sites located in Germany and France.
Numerical Simulation of Permeability Heterogeneity in Single- and Two-phase Flow Systems to Assess the Performance of Enhanced Geothermal System
Author: Dejian Zhou
Publisher:
Published: 2022
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKThe development of Enhanced Geothermal System (EGS) technology leads to the possibility of an extensive application of geothermal energy, which is attractive because of its ability to reduce CO2 emissions and dependence on traditional fossil fuels. Different from the conventional porous geothermal reservoirs, the EGS reservoirs are located several kilometers underground and formed by artificial fractured zones and surrounding rock matrix. Due to the higher permeability and porosity, the artificial fractured zones determine the fluid flow and heat transfer in EGS reservoirs. Thus, the repres...
A Method of Fundamental Solutions in Poroelasticity to Model the Stress Field in Geothermal Reservoirs
Author: Matthias Albert Augustin
Publisher: Birkhäuser
Published: 2015-07-15
Total Pages: 245
ISBN-13: 3319170791
DOWNLOAD EBOOKThis monograph focuses on the numerical methods needed in the context of developing a reliable simulation tool to promote the use of renewable energy. One very promising source of energy is the heat stored in the Earth’s crust, which is harnessed by so-called geothermal facilities. Scientists from fields like geology, geo-engineering, geophysics and especially geomathematics are called upon to help make geothermics a reliable and safe energy production method. One of the challenges they face involves modeling the mechanical stresses at work in a reservoir. The aim of this thesis is to develop a numerical solution scheme by means of which the fluid pressure and rock stresses in a geothermal reservoir can be determined prior to well drilling and during production. For this purpose, the method should (i) include poroelastic effects, (ii) provide a means of including thermoelastic effects, (iii) be inexpensive in terms of memory and computational power, and (iv) be flexible with regard to the locations of data points. After introducing the basic equations and their relations to more familiar ones (the heat equation, Stokes equations, Cauchy-Navier equation), the “method of fundamental solutions” and its potential value concerning our task are discussed. Based on the properties of the fundamental solutions, theoretical results are established and numerical examples of stress field simulations are presented to assess the method’s performance. The first-ever 3D graphics calculated for these topics, which neither requiring meshing of the domain nor involving a time-stepping scheme, make this a pioneering volume.
Numerical Model Studies of Enhanced Geothermal Systems
Author: Ivan Guillermo Vazquez Rubio
Publisher:
Published: 2016
Total Pages: 204
ISBN-13:
DOWNLOAD EBOOKEnhanced Geothermal Systems (EGS) are being developed around the world as a method of extraction of thermal energy. A good EGS reservoir should maintain a small thermal drawdown and low water loss. All factors must be considered for optimal levels of energy production and assuring a long life span of the reservoir. It is where numerical simulation models are used as reservoir performance predictive tools to find these parameters. A benchmark problem for the Fenton Hill Phase I EGS was numerically simulated as the first task with four runs contemplating a single planar penny shape fracture in the rockmass with a given lateral extension. The first run evaluates a constant aperture fracture while the second run deals with a variable aperture, penny shape fracture. The third and fourth runs evaluate a similar model but with an increased backpressure in the reservoir. The second task is a challenge problem with multiple fractures in Fenton Hill Phase II. The geometry of the fractures had to be determined from the literature data that included dip, strike and depth information. MicroEarthQuakes (MEQ) data were also available from field measurements at Fenton Hill Phase II for graphical matching the fracture positions in the model in 3D AutoCAD. The fluid circulation was modeled assuming planar flow channels and using fine spatial discretization in the fracture volumes. Hydro-Mechanical processes are matched with experimental flow measurements data. Calibration was achieved by matching between the model prediction and the steady state injection flow test experiment at Fenton Hill Phase II.
Geothermal Fields of India
Author: Kriti Yadav
Publisher: Springer Nature
Published:
Total Pages: 175
ISBN-13: 303153364X
DOWNLOAD EBOOKGeothermal Energy Utilization and Technologies 2020
Author: Carlo Roselli
Publisher: MDPI
Published: 2021-08-31
Total Pages: 350
ISBN-13: 3036507043
DOWNLOAD EBOOKRising pollution, climate change and the depletion of fossil fuels are leading many countries to focus on renewable-based energy conversion systems. In particular, recently introduced energy policies are giving high priority to increasing the use of renewable energy sources, the improvement of energy systems’ security, the minimization of greenhouse gas effect, and social and economic cohesion. Renewable energies’ availability varies during the day and the seasons and so their use must be accurately predicted in conjunction with the management strategies based on load shifting and energy storage. Thus, in order to reduce the criticalities of this uncertainty, the exploitation of more flexible and stable renewable energies, such as the geothermal one, is necessary. Geothermal energy is an abundant renewable source with significant potential in direct use applications, such as in district heating systems, in indirect use ones to produce electricity, and in cogeneration and polygeneration systems for the combined production of power, heating, and cooling energy. This Special Issue includes geothermal energy utilization and the technologies used for its exploitation considering both the direct and indirect use applications.
Modeling of Geothermal Reservoirs
Author:
Publisher:
Published: 1988
Total Pages:
ISBN-13:
DOWNLOAD EBOOKThis article attempts to critically evaluate the present state of the art of geothermal reservoir simulation. Methodological aspects of geothermal reservoir modeling are briefly reviewed, with special emphasis on flow in fractured media. Then we examine applications of numerical simulation to studies of reservoir dynamics, well test design and analysis, and modeling of specific fields. Tangible impacts of reservoir simulation technology on geothermal energy development are pointed out. We conclude with considerations on possible future developments in the mathematical modeling of geothermal fields. 45 refs., 4 figs., 2 tabs.
Computational Modeling of Shallow Geothermal Systems
Author: Rafid Al-Khoury
Publisher: CRC Press
Published: 2011-09-30
Total Pages: 256
ISBN-13: 0415596270
DOWNLOAD EBOOKA Step-by-step Guide to Developing Innovative Computational Tools for Shallow Geothermal Systems Geothermal heat is a viable source of energy and its environmental impact in terms of CO2 emissions is significantly lower than conventional fossil fuels. Shallow geothermal systems are increasingly utilized for heating and cooling of buildings and greenhouses. However, their utilization is inconsistent with the enormous amount of energy available underneath the surface of the earth. Projects of this nature are not getting the public support they deserve because of the uncertainties associated with them, and this can primarily be attributed to the lack of appropriate computational tools necessary to carry out effective designs and analyses. For this energy field to have a better competitive position in the renewable energy market, it is vital that engineers acquire computational tools, which are accurate, versatile and efficient. This book aims at attaining such tools. This book addresses computational modeling of shallow geothermal systems in considerable detail, and provides researchers and developers in computational mechanics, geosciences, geology and geothermal engineering with the means to develop computational tools capable of modeling the complicated nature of heat flow in shallow geothermal systems in rather straightforward methodologies. Coupled conduction-convection models for heat flow in borehole heat exchangers and the surrounding soil mass are formulated and solved using analytical, semi-analytical and numerical methods. Background theories, enhanced by numerical examples, necessary for formulating the models and conducting the solutions are thoroughly addressed. The book emphasizes two main aspects: mathematical modeling and computational procedures. In geothermics, both aspects are considerably challenging because of the involved geometry and physical processes. However, they are highly stimulating and inspiring. A good combination of mathematical modeling and computational procedures can greatly reduce the computational efforts. This book thoroughly treats this issue and introduces step-by-step methodologies for developing innovative computational models, which are both rigorous and computationally efficient.
Numerical Modeling of an Enhanced Geothermal System with High Permeability in Kizildere Field, Turkey
Author: Burak Firat
Publisher:
Published: 2022
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKGeothermal energy has the potential to be a key player in energy transformation all over the world through Enhanced Geothermal Systems (EGS). This study evaluates the energy production from the geothermal reservoir located in the Kizildere field in Turkey in conjunction with analytical and numerical approaches. Moreover, this work investigates the impact of natural fracture networks in this high-permeability field. First, the Kizildere field data were evaluated, and then the data were analyzed for energy production for 50 years by applying a few analytical models. The field was simulated for 50 years using CMG Thermal STARS with a novel code, thermal Embedded Discrete Fracture Model (EDFM). The simulations analyzed the effects of different well designs on heat generation. Sensitivity analysis was by using various natural fracture network densities. The results show that the number of natural fractures in high permeable reservoirs does not impact the amount of heat extraction because the circulation fluid mainly flows through the matrix instead of fractures in EGS with high permeability. In addition, this thesis shows that the impact of well placement primarily depends on reservoir dimensions. Additional work was done regarding the effect of high temperature in the selection of casing. Furthermore, the thesis delivers forecasts and possible recommendations for further research
